What is the function of a centrifugal clutch?

The primary function of a centrifugal clutch is to use the centrifugal force for the transmission of the rotation movement from an axis to a bell. When exceeding a given speed, the masses of the device overcome the force of some springs and rub against the bell that transmits that movement to another part of the machine.

When the engine or the electric motor reaches a certain speed, the clutch activates, working somewhat like a continuously variable transmission. As the load increases, the speed drops, disengaging the clutch, letting the speed rise again and reengaging the clutch.